Uma uzwa 'ukusakaza kwensimbi okunembayo', izingqondo eziningi zigxuma ziqonde ekulingiseni utshalomali. Lokho akulona iphutha, kodwa kuyisiqalo esivame ukuphuthelwa ihlathi ngenxa yezihlahla. Ukunemba kwangempela akukhona nje ngegama lenqubo; imayelana nayo yonke i-ecosystem of control—kusukela ekuncibilikeni kwezigxivizo zeminwe zengxubevange ukuya ekubekezeleni kokugcina komshini. Ngibone amaphrojekthi amaningi efa ngenxa yokuthi othile ucacise 'ukusakazwa okunembayo' emdwebeni ngaphandle kokuchaza ukuthi lokho kwakusho ukuthini emsebenzini wengxenye yabo. Ingabe kwakuwukuphela kwendawo? Ukuzinza kwe-dimensional ngaphansi kokushisa? Ukuvumelana phakathi kwenqwaba yezingcezu eziyi-10,000? Lokho kungacaci kulapho kuzalwa khona izinkinga.
Umdlalo Weshell: Ngaphezu Kwesihlabathi Nje
Thatha i-shell mold casting. Ifakwa phakathi ngokusakazwa kwesihlabathi okulula ngezinye izikhathi, kodwa lokho kuwukungahloniphi. Ukunemba lapha kuvela kusikhunta sesihlabathi esihlanganiswe ne-resin uqobo. Iqinile. Lokho kuqina kusho ukunyakaza okuncane kodonga lwesikhunta ngesikhathi sokuthululwa, okuhumusheka ngokuqondile ekuthembekeni okungcono kwe-dimensional. Asikhulumi ngokubamba ama-intshi angu-+/- 0.005 kuyo yonke indawo—eyokutshalwa kwezimali—kodwa kumajometri athile, ikakhulukazi izinto ezinkulu, eziyisicaba, kungashintshashintsha ngokuphawulekayo futhi kungabizi kakhulu. Iqhinga liwukwazi ukuthi uyisebenzise nini. Ngikhumbula ubakaki wepompo ye-heavy-duty, umumo olula kodwa onezimbobo ezimbili ezibucayi. Ukubunjwa kwesihlabathi esiluhlaza kusinikeze ukuhlukahluka okukhulu emigodini enezintambo, okuholela esikhathini esinonya sokusetha imishini. Ukushintshela ku-shell mold kulungise inkinga yoshintsho oluyinhloko cishe ngokuphelele. Izindleko zokukhunta zaziphezulu, kodwa songa okwengeziwe emsebenzini womshini kanye ne-scrap. Lokho kuyinto engokoqobo ukunemba metal cast isinqumo.
Lapho isikhunta segobolondo singakuluma khona kulindelwe ekugcineni. Uzothola isiphetho esihle, ngokuqinisekile esingcono kunesihlabathi esivamile, kodwa sizoba nokuthungwa okusanhlamvu okuyisici. Uma i-spec idinga isiphetho esihlanzekile, esilungele ukupulwa, ungase udumale. Ngokuvamile idinga ukuqhuma okuncane noma ukukhanda imishini. Ngifunde ukuthi kunzima kuphrojekthi yangaphambi kwesikhathi, kucatshangwa ukuthi ikhasimende lizoqonda ukubukeka 'njengokusakaza'. Abazange. Manje, ukuphatha lokho okulindelekile kuyingxenye yokubuyekezwa kokuqala.
Ukukhetha kwezinto ezibonakalayo kuyadlala futhi. Sisebenzisa insimbi eningi eyi-ductile ne-carbon steel ngokusebenzisa isikhunta samagobolondo esitolo sethu. Inqubo iphatha kahle ukushaqeka okushisayo kwama-alloys ayoni. Kodwa ngibonile imizamo yokusebenzisa ama-alloys ane-nickel ephezulu ngokusetha okufanayo, futhi izici ezishisayo zihlukile-kungaholela ekudwebeni okushisayo uma i-gating nokupholisa kungalungiswa. Yilokho umehluko. Inqubo akuyona nje inkinobho oyicindezelayo; isethi yamapharamitha ashadisa impahla nesikhunta.
Ukusakaza Kwezimali: Inketho esobala, enezingqinamba ezifihliwe
Ukufakwa kwe-investimenti kuyiphosta yengane ukunemba metal cast, futhi ngesizathu esihle. Igobolondo le-ceramic elakheke eduze kwephethini ye-wax ikunikeza lokho kuqeda okumangalisayo nekhono lokuthwebula imininingwane emihle. Kodwa 'ukunemba' lapha akwenzeki. Inqubo yephethini ye-wax ngokwayo ingumthombo ongaba khona wokuhlukahluka. Uma amapharamitha omjovo we-wax engavaliwe—izinga lokushisa, ingcindezi, izinga lokupholisa—iphethini yobukhulu iyantengantenga, futhi lokho kuntengantenga kuyaphindwa kuwo wonke amagobolondo nakuwo wonke ukusakaza kokugcina. Ngichithe amasonto ngidayela ezinqubweni ze-wax zomndeni omusha. Umsebenzi oyisicefe, oyisisekelo ongabukeki ubukhazikhazi kodwa onquma yonke into elandelayo.
Bese kuba nesakhiwo samagobolondo. Amajazi ediphu, isicelo se-stucco. Umsebenzi wezandla, wobuciko ngisho nasendaweni yesimanje. Ikhono likachwepheshe osebenzisa ijazi le-slurry eliyinhloko libaluleke kakhulu ekuthwebuleni imininingwane emihle. Izacile kakhulu, futhi usengozini yokuhluleka kwegobolondo noma ukungena kwensimbi. Kujiye kakhulu, futhi ungase ulahlekelwe amakhona acijile. Sake saba nenkinga ngezindonga ezincanyana ku-stainless steel manifold. Amaphethini we-wax ayephelele, kodwa insimbi 'yayigeza' i-ceramic ezindaweni ezithile ngesikhathi sokuthela. Isixazululo kwakungewona amandla anonya; bekulungisa i-viscosity yejazi lokuqala le-slurry kanye nebanga lezinto ze-stucco ukuze kwakhiwe ungqimba lokuqala oluqinile, nokho olunembile, lokuqala. Lokhu ubumbudumbudu bokulawula obuchaza ukunemba kwangempela.
Futhi ukuncipha. Wonke umuntu uyazi mayelana nezibonelelo zokuncipha eziqondile, kodwa ukusebenzisana phakathi kwe-alloy negobolondo le-ceramic ngesikhathi sokupholisa kudala izingqinamba. Ngokwengxenye eyinkimbinkimbi, i-alloy ayinciphi ngokufana. Lokhu kungaholela ekucindezelekeni okusele noma, esimweni esibi kakhulu, imifantu eshisayo. Sisebenza ngokuningi insimbi engagqwali nama-alloys akhethekile afana ama-alloys asekelwe ku-cobalt yokunquma i-valve. Lezi zinto zinokuziphatha kwazo okuhlukile kokuncipha kanye namajika okuqina ezingeni lokushisa. Isistimu yokufaka isango kufanele yakhelwe hhayi nje ukondla insimbi, kodwa ukuvumela ukusakaza ukuthi kunciphe ngokumelana okuncane negobolondo. Kungumdanso phakathi kwejiyomethri, i-metallurgy, nesayensi yobumba. Ukuthela okuhlulekile engxenyeni ebizayo ye-nickel-alloy kukufundisa okwengeziwe ngalowo mdanso kunanoma iyiphi incwadi.
I-Machining Handshake: Lapho Ukunemba Kokusakaza Kufakazelwe khona
Ayikho ingxoxo ye ukunemba metal cast kuqedile ngaphandle kokuthinta imishini. Abahlukaniseki. Ukulingisa kungaba kuhle ngokwengxenye ku-CMM, kodwa uma kungenakho ubuciko noma kunobunzima obungaguquki, kuyiphupho elibi esitezi se-CNC. Kulapho imisebenzi edidiyelwe, njengalokho esikwakhile eminyakeni edlule, ikhombisa khona ukubaluleka kwayo. Iluphu yempendulo ifushane. Uma ithimba lemishini lithola ukuthi ama-drill bits aguga ngokushesha kakhulu eqoqweni lama-castings, angahamba abuyele endaweni yokusungula futhi singabheka i-microstructure. Ingabe izinga lokupholisa livaliwe? Ingabe kukhona ukwakheka kwe-carbide okungalindelekile kulokhu kushisa kwe insimbi?
Ngikhumbula ingxenye ye-hydraulic block. Ukufakwa kwe-investimenti bekucishe kufane, kodwa bekunezimbobo eziyisithupha ezijulile, ezikwazi ukubekezelela ukunemba okufanele zibhodwe bese zithintwa. Amaqoqo okuqala ambalwa asebenza kahle. Bese, iqoqo elisha liqale ukubangela ukuphuka kompompi. Ubukhulu bokulingisa babufana. Udaba lulandelelwe emuva ekuhlukeni okuncane kokuqukethwe kwe-phosphorus kokuphakelayo kwensimbi engagqwali, okwenze okokusebenza 'kuqinile' futhi kungabi nobungane ekuthepheni. Ukulungiswa kwaba ukulungiswa kwamakhemikhali amancane kanye ne-tweak emjikelezweni wokukhipha ngemuva kokusakazwa. Ngaphandle kokulawula lonke uchungechunge, uzobe uthumela nje ukusakaza ikhasimende lakho elingakwazi ukukumshini kahle, okulimaza ubudlelwano. Ukunemba kuwumphumela olethiwe, hhayi nje isimo esithunyelwe.
Yingakho izinkampani ezihlanganisa ukukhishwa kanye nomshini ngaphansi kophahla olulodwa, njenge I-Qingdao Qiangsenyuan Technology Co., Ltd. (QSY), abe nenzuzo engokwemvelo yezingxenye ezibalulekile. Njengoba sebesebenze iminyaka engaphezu kwamashumi amathathu, bayaqonda ukuthi ukukhishwa kwesithando somlilo kuya ku-CNC akuyona into eyenziwayo; kungukuqhubeka. Isidingo sikamashini sezinto eziyisisekelo ezizinzile, ezingabikezelwa sazisa ngokuqondile inqubo yomsunguli. Lapho ubhekene ama-alloys akhethekile ezibizayo futhi okunzima ukuwenza, lokhu kuhlanganiswa akuyona into ewubukhazikhazi; kuyisidingo sokuzuza okuthembekile, okungabizi kakhulu ukunemba metal cast imiphumela.
Impahla ngumlayezo
Awukwazi ukukhuluma ngokunemba ngaphandle kokukhuluma. Ingxubevange ayiyona nje into yomugqa eshidini elicacisiwe; ilawula yonke inqubo. Insimbi futhi insimbi engagqwali ziphatha ngendlela ehlukile esikhunjeni. I-stainless, nephoyinti layo lokuncibilika eliphakeme kanye noketshezi oluhlukile, imvamisa idinga amazinga okushisa aphezulu okuthela kanye nedizayini yokungena ecophelelayo ukuze kugwenywe ama-mistruns noma ukufakwa kwe-oxide. Okubizwa ngokuthi 'ama-alloys akhethekile'—i-nickel-based and ama-alloys asekelwe ku-cobalt- omunye umhlaba. Zivame ukuthululwa ukuze zisetshenziswe ngokwedlulele: izinga lokushisa eliphezulu, ukugqwala okuphezulu, ukumelana nokugqoka. Inselele yabo yokunemba ngokuvamile imayelana nobuqotho. I-Porosity ekulinganisweni okujwayelekile ingase yamukeleke; endaweni ye-jet turbine blade esakazwe ku-nickel superalloy, kuyinhlekelele.
Sasebenza engxenyeni yephampu yokucubungula amakhemikhali, ecaciswe kunsimbi engagqwali eyi-duplex. Ukumelana nokugqwala bekubalulekile. Abalingisi bokuqala bahlangabezane ne-dimensional specs kodwa behlulekile ekuhlolweni kokugqwala. Inkinga? Ibhalansi yesigaba se-ferrite-austenite ibivaliwe ngenxa yokuthi izinga lokupholisa ngebanga lokushisa elibalulekile alizange lilawulwe ngokuqinile ngokwanele kugobolondo le-ceramic. Ukuzuza 'ukunemba' kwakusho ukuphatha isakhiwo se-metallurgical, hhayi nje isimo sangaphandle. Kudingeke ukuthi siguqule ukwakheka kwegobolondo ukuze siguqule kancane izakhiwo zalo zokuvikela futhi sisebenzise iphrothokholi yokupholisa elawulwayo ngemva kokuthelwa. Yengeze izinyathelo, kodwa kwaba ukuphela kwendlela yokuhlangabezana nemfuneko yokusebenza kwezinto, okwakuyinjongo yangempela yokunemba kwabalingisi.
Yilapho ama-generic foundries eshayisa khona udonga. Ukuphatha izinto ezingavamile akukhona nje ngokuba nesithando somlilo esingafinyelela izinga lokushisa. Kumayelana nolwazi lokuthi leyo ngxubevange iqina kanjani, isabela kanjani ngezinto ezihlukene zokubunjwa, nokuthi yiziphi izindlela zokwelapha ezidingekayo zokushisa ngemva kokusakazwa ukuze kukhishwe izakhiwo ezidingekayo. Lulwazi olujulile, oluyisipesheli olwakheka phakathi neminyaka, ngokuvamile ngokuzama namaphutha. Ufunda ukuthi yimaphi ama-alloys athambekele ku-micro-shrinkage, yimaphi adinga umjikelezo oshisayo we-isostatic press (HIP) njengenqubo evamile yokudiliza noma yikuphi ukuqina kwangaphakathi. Lolo lwazi luyingxenye eyinhloko yezibalo ezinembile.
Isilinganiso Sangempela: Ukuvumelana Kwevolumu
Ekugcineni, ukuhlolwa kokugcina kwe-a ukunemba metal cast inqubo ayiyona i-prototype eyodwa ephelele. Isiqephu sama-500 emqhudelwaneni wokukhiqiza njengoba sihamba kahle njengesokuqala. Ukuphindaphinda kuyinkosi. Lapha yilapho amadokhumenti okulawula inqubo, amashejuli okuhlola aqinile, nokulawulwa kwenqubo yezibalo (SPC) kungena khona. Kuncane ngobuciko nokunye okwengeziwe ngesayensi. Ukuqapha i-viscosity yokugeza okunodaka nsuku zonke, ukuhlola ubukhulu bephethini ye-wax ngamageji e-go/no-go njalo emijikelezweni embalwa, ukwenza ukuhlolwa okulimazayo ngezikhathi ezithile kumasampula okulingisa ukuze kuhlolwe ukuzwakala kwangaphakathi.
Sihlinzeka ngezingxenye zabalingisi zomhlangano wokuhambisa izimoto. Ivolumu iphezulu, ukubekezelelana kuqinile, futhi izindleko zokwehluleka zinkulu. Ukunemba lapha kuchazwa amanani e-CPK kubukhulu obubalulekile. Ukuze ushaye lezo zinombolo ngokungaguquki, konke okuguquguqukayo ochungechungeni kufanele kuqashelwe futhi kulawulwe. Izinga lokushisa lensimbi ngaphambi kokuthululelwa, izinga lokushisa langaphambi kokushisa kwezibunjwa, umswakama osendaweni ekamelweni lokumisa igobolondo (kuthinta amazinga okomisa). Iwuhlelo.
Uma usebenza nozakwethu like QSY, iminyaka yabo engu-30 ekulingiseni nasekukhiqizeni imishini ihumushela ezinhlelweni ezimisiwe, ezicwengisisiwe zalolu hlobo lokunemba kwevolumu. Kungenzeka ukuthi babone izindlela zokuhluleka, bakhe izindawo zokuhlola, futhi baqonda izindleko zokuvumela ipharamitha ikhukhuleke. Kumthengi, lokho kukhula kwenqubo yomlando ngokuvamile kubaluleke kakhulu kunomshini omusha ocwebezelayo. Kusho izimanga ezimbalwa. Futhi ekukhiqizeni, azikho izindaba eziyizindaba ezinhle. Ukuletha inqwaba ngemva kwenqwaba evele ilingane futhi isebenze—lelo iqiniso elithulile, elingenabukhazikhazi lezinga lezimboni ukunemba metal cast. Akukona ukwenza umsebenzi wobuciko owodwa; kumayelana nokwenza izinkulungwane eziyishumi ezifanayo, izingxenye ezithembekile ukuthi omunye angakha umkhiqizo wakhe nxazonke ngaphandle komcabango wesibili.
